<template>
  <view>
    <!--使用自定义搜索组件-->
    <!--<my-search :bgcolor="'#000000'" :radius="3"></my-search>-->
    <my-search @click="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!--左侧滑动区域-->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i=== active? 'active' : '']" @click="activeChange(i)">{{item.cat_name}}</view>
        </block>
        <view class="left-scroll-view-item">xxx</view>
      </scroll-view>
      <!--右侧滑动区域-->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <!--二级分类的标题-->
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <!--动态渲染三级分类的列表-->
          <view class="cate-lv3-list">
            <!--三级分类的item项-->
            <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //当前设备可用高度
        wh:0,
        cateList:[],
        active: 0,
        //二级分类的列表
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      
      this.getCateList()
    },
    methods: {
      //获取分类列表的数据
      async getCateList(){
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return
        this.cateList = res.message
        
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i){
        this.active = i
        
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item3) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  
  .left-scroll-view{
    width: 120px;
    
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active{
        background-color: #ffffff;
        position: relative;
        &::before{
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}  
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    
    .cate-lv3-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      
      image{
        width: 60px;
        height: 60px;
      }
      
      taxt{
        font-size: 12px;
      }
    }
  }

</style>
